If the child is Rounak's, there's really no point in keeping it. It's just a lot of pain and suffering for everyone (except Rounak, I guess).
Of course, what I hate about indian serials is that they're too scared to actually have their characters go through with an abortion, because of the cultural stigma surrounding it. This is unfortunate because abortion can be a real life-saver in instances of rape and incest and should be portrayed as such.
What I believe Pavitra Rishta should show is Mansi getting an abortion and not being harshly judged for it, but rather supported by her family and friends for her choice. PR should be starting a healthy dialogue about these situations. It is in the perfect position to start a dialogue, but they always shove all that backward misogynistic stuff down our throats instead of actually trying to introduce some social commentary.